If a stress is applied to a polycrystal of grain size L, the mode of creep deformation depends on the answers to the following questions: (I) does exceed the Peierls stress p; (II) does L exceed the dislocation spacing in a Taylor lattice stabilized by p; (III) does L exceed the value required for a FrankRead or BardeenHerring source to operate within the grain; (IV) does L1=2 exceed the HallPetch value required for slip to propagate across a grain boundary? The (L; ) plane is thus partitioned into regions in which dierent modes of creep predominate. 1. Diusional Creep and HarperDorn Creep In diusional creep, transport of matter occurs by the migration of vacancies from grain boundaries roughly nor-mal to a tensile stress to boundaries ...
International audienceIn polycrystals, stress-driven vacancy diffusion at high homologous temperatur...
The effects of grain boundaries on the plasticity of metallic polycrystals loaded at room temperatur...
The grain size dependence of the flow strength of polycrystals is analyzed using plane strain, discr...
Previous studies demonstrate that grain-boundary sliding could accelerate creep rate and give rise t...
Plastic flow of polycrystalline solids at elevated temperatures occurs by one of three independent d...
Diffusion-controlled-creep processes are used to assess the creep behavior of dispersion and solute ...
At elevated temperatures, creep in polycrystalline aggregates is often accompanied by free grain bou...
Three models of power-law creep are frequently presented. Those of Weertman assume distributed sourc...
A review is presented of the debates between the present authors and other investigators regarding t...
A continuum theory based on thermodynamics has been developed for modeling diffusional creep of poly...
A grain size dependent rheological model is presented for high temperature creep that is capable of ...
Delayed elastic phenomenon during high-temperature creep of polycrystalline materials is correlated ...
A fine mechanical analysis of a polycrystalline material subjected to large stresses must distinguis...
The deformation mechanisms occurring in coarse-grained polycrystalline materials are now understood ...
Polycrystalline materials with mean grain size smaller than 10nm will soften if its mean grain size ...
International audienceIn polycrystals, stress-driven vacancy diffusion at high homologous temperatur...
The effects of grain boundaries on the plasticity of metallic polycrystals loaded at room temperatur...
The grain size dependence of the flow strength of polycrystals is analyzed using plane strain, discr...
Previous studies demonstrate that grain-boundary sliding could accelerate creep rate and give rise t...
Plastic flow of polycrystalline solids at elevated temperatures occurs by one of three independent d...
Diffusion-controlled-creep processes are used to assess the creep behavior of dispersion and solute ...
At elevated temperatures, creep in polycrystalline aggregates is often accompanied by free grain bou...
Three models of power-law creep are frequently presented. Those of Weertman assume distributed sourc...
A review is presented of the debates between the present authors and other investigators regarding t...
A continuum theory based on thermodynamics has been developed for modeling diffusional creep of poly...
A grain size dependent rheological model is presented for high temperature creep that is capable of ...
Delayed elastic phenomenon during high-temperature creep of polycrystalline materials is correlated ...
A fine mechanical analysis of a polycrystalline material subjected to large stresses must distinguis...
The deformation mechanisms occurring in coarse-grained polycrystalline materials are now understood ...
Polycrystalline materials with mean grain size smaller than 10nm will soften if its mean grain size ...
International audienceIn polycrystals, stress-driven vacancy diffusion at high homologous temperatur...
The effects of grain boundaries on the plasticity of metallic polycrystals loaded at room temperatur...
The grain size dependence of the flow strength of polycrystals is analyzed using plane strain, discr...